public class GraphObserver implements Observer {
  public void update( NumberGenerator generator ){

    System.out.print("GraphObserver:");
    int count = generator.getNumber();
    for( int i = 0; i< count; i++){

      System.out.print("*");

    }
    System.out.println("");
    try{

      Thread.sleep(100);
    }catch( InterruptedException e ){
    }
  }
}